Magnetizing inrush current suppression device

A technology for excitation inrush current and suppression devices, which is applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve problems such as difficult to find the intersection point of residual magnetic flux and constant magnetic flux

Active Publication Date: 2015-02-18
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the case of the residual magnetic flux having the AC component superimposed on the DC component in this way, it is

Method used

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  • Magnetizing inrush current suppression device
  • Magnetizing inrush current suppression device
  • Magnetizing inrush current suppression device

Examples

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Embodiment approach

[0021] figure 1 It is a configuration diagram showing the configuration of a power system to which the excitation inrush current suppression device 6 according to the embodiment of the present invention is applied. In addition, the same reference numerals are assigned to the same parts in the subsequent drawings, and detailed description thereof will be omitted, and the different parts will be mainly described.

[0022] The power system according to this embodiment includes a power bus 1, a three-phase circuit breaker 2, a transformer 3, three-phase power supply voltage detectors 4U, 4V, and 4W, three-phase transformer terminal voltage detectors 5U, 5V, and 5W, and an excitation Surge suppression device 6.

[0023] The power supply bus 1 is a bus of an electric power system including a three-phase AC power supply composed of a U-phase, a V-phase, and a W-phase.

[0024] The primary side of the transformer 3 is connected to the power bus 1 via the circuit breaker 2 . The tra...

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Abstract

A magnetizing inrush current suppression device (6) that controls a breaker (2), wherein inter-pole capacitors (22U, 22V, 22W) are connected, and which opens/closes a connection between a transformer (3) and a three-phase alternating-current power supply (1) so as to control magnetizing inrush current. On the basis of the three-phase alternating current voltages (Vtu, Vtv, Vtw) on the transformer side of the breaker (2), the phase for which the absolute value is the largest or the phase for which the absolute value is the smallest, of the direct current components (Zdu, Zdv, Zdw) of the three-phase residual flux, is detected as the phase of interest. In addition, the breaker (2) is closed at the phase of interest when the phase of interest of the three-phase alternating current voltages (Vu, Vv, Vw) on the power supply side is a closing target phase (thetac1) having a wave-height value which is the reverse polarity of the polarity of the direct current component (Zdu, Zdv, Zdw) of the residual flux, and the breaker (2) is closed at the two phases other than the phase of interest when the phase of interest of the three-phase alternating current voltages (Vu, Vv, Vw) on the power supply side is a closing target phase (thetac2) which reaches zero after the closing target phase (thetac1).

Description

technical field [0001] The present invention relates to a magnetizing inrush suppressing device for suppressing a magnetizing inrush generated when a transformer is turned on to a power supply. Background technique [0002] Generally, it is known that a large excitation inrush current flows when the power is turned on and no-load excitation is performed with residual magnetic flux in the transformer core. The magnitude of this magnetizing inrush current becomes several times the rated load current of the transformer. If a large inrush current flows in this way, the system voltage fluctuates. When this voltage fluctuation is large, it may affect the requester. [0003] As a method of suppressing this magnetizing inrush current, it is known that when connecting a directly grounded three-phase transformer with three single-phase circuit breakers, one of the arbitrary phases is first connected, and then the remaining two phases are connected. Methods of suppressing magnetizin...

Claims

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Application Information

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IPC IPC(8): H01H33/59H01H9/54H01H33/44H02H7/045H02J3/00
CPCH01H33/59H01H33/44H02H9/002H01H33/593H01H33/022
Inventor 腰塚正丸山志郎斋藤实前原宏之铃木浩二
Owner KK TOSHIBA
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